Well I really was just trying to test the battery life of my iphone 4 since I just got it replaced with a refurbished. So I test battery life with netflix 3G streaming. Got about 5 hours of battery life until it went dead. My previous iphone 4 got around 6 hours of continous slingbox streaming. So battery life is ok with the refurb. I ran the test again and iphone 4 died at around the same 5 hour mark. When I went to check my data usage this morning. So streaming 10 hours (about 5 netflix movies), I consumed 2GB of data. That's like 200MB of data for each hour of netflix streaming. So I understand how some people can consume 10-20 GB of data each month with netflix streaming on their iphone. I didn't watch any of the movies, I just tested it to drain my battery life. At most I only stream 3 or 4 netflix movies a month and that's only on my Apple TV at home. Now those using 100GB of data....they are probably tethering to their computers.